SPL Parts FKS Series Front Spherical Caster Rod Bushing Set

2014–2018 BMW 328d xDrive (F30/F31) / 2013–2015 BMW 335i (F30)

Part #: SPL CRBN F3IX

Overview

The SPL Parts FKS Series Front Spherical Caster Rod Bushing Set is designed to enhance the handling and suspension performance of your BMW F30/F31 chassis models. Specifically engineered for the 2014-2018 BMW 328d xDrive and the 2013-2015 BMW 335i, this set replaces the factory rubber bushings with high-performance spherical bearings. Whether you're a spirited driver, track enthusiast, or someone seeking improved steering response, these bushings deliver precise articulation and reduced deflection, resulting in sharper handling and more direct feedback from your vehicle.

By upgrading to these spherical bushings, you'll experience a more consistent suspension geometry under load, which translates to improved braking stability, cornering confidence, and overall driving feel. Designed with durability and performance in mind, this set is ideal for those looking to push their BMW's handling capabilities without sacrificing everyday drivability.

Key Features

The SPL Parts FKS Series Bushings incorporate several advanced features to maximize performance and longevity:

• Massive 1" FK Racing Bearings: These high-quality spherical bearings are crafted from durable materials to withstand rigorous driving conditions and provide consistent articulation.
• Self-Lubricating Teflon Liners: The bearings are equipped with Teflon liners that reduce friction and eliminate the need for regular lubrication, ensuring smooth operation over time.
• 6061-T6 Aluminum Housing: The lightweight yet robust aluminum housings are CNC-machined for precise fitment and excellent durability, resisting corrosion and heat buildup.
• Low Friction, Articulating Design: The spherical bearings eliminate bushing deflection, maintaining optimal suspension geometry and improving handling feedback during aggressive driving or track use.
• Enhanced Suspension Response: By reducing compliance in the caster rods, these bushings help support more precise steering and improved feedback, especially during high-load conditions.
• Direct OEM Replacement: Designed to bolt directly into your vehicle's existing suspension points, these bushings require no modifications for installation.
• Durable Construction: Built to withstand the stresses of spirited driving, these bushings are suitable for both street and track applications, offering long-lasting performance.

Construction & Design

The SPL Parts FKS Series Bushings are meticulously engineered using high-grade materials to ensure maximum strength and reliability. The CNC-machined 6061-T6 aluminum housings provide a precise fit and excellent resistance to corrosion. The massive 1" FK Racing spherical bearings are designed with self-lubricating Teflon liners, which significantly reduce friction and wear, ensuring smooth articulation and consistent performance over time. This combination of materials and design choices results in a lightweight, durable, and high-performance bushing set that maintains suspension geometry and enhances handling characteristics.

Performance & Handling

Replacing the stock flexible rubber bushings with these spherical bearings dramatically improves suspension response and steering precision. You'll notice more immediate and predictable handling feedback, especially during aggressive cornering or spirited driving. The reduction in bushing deflection helps maintain proper suspension geometry under load, leading to improved braking stability and cornering confidence. While specific horsepower or torque gains are not claimed, the upgrade supports better overall vehicle dynamics and driver confidence.

Installation & Fitment

The SPL Parts FKS Series Bushings are designed as direct bolt-on replacements for the factory caster rod bushings on the specified BMW models. Installation typically requires basic hand tools and a suspension press or bushing removal tool. No cutting, drilling, or complex modifications are necessary, making this an accessible upgrade for DIY enthusiasts and professional installers alike. Proper alignment is recommended after installation to ensure optimal suspension geometry and handling performance.

• Direct replacement for factory bushings
• No cutting or drilling required
• Installation typically takes 1–2 hours
• Suitable for street, track, and spirited driving applications

What's Included

• Set of front spherical caster rod bushings with FK Racing spherical bearings
• 6061-T6 aluminum housings
• All necessary hardware and mounting components
• Installation instructions

Ideal For

• BMW enthusiasts seeking improved handling and steering response
• Track day and performance driving enthusiasts
• Owners looking to reduce suspension deflection and maintain optimal geometry under load
• DIYers and professional mechanics performing suspension upgrades